149997690 has 64 divisors (see below), whose sum is σ = 401397120. Its totient is φ = 39859200.

The previous prime is 149997637. The next prime is 149997691. The reversal of 149997690 is 96799941.

149997690 is a `hidden beast` number, since 1 + 499 + 97 + 69 + 0 = 666.

It is a super-2 number, since 2×149997690² = 44998614010672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (149997691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92890 + ... + 94490.

It is an arithmetic number, because the mean of its divisors is an integer number (6271830).

Almost surely, 2^149997690 is an apocalyptic number.

149997690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 149997690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200698560).

149997690 is an abundant number, since it is smaller than the sum of its proper divisors (251399430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

149997690 is a wasteful number, since it uses less digits than its factorization.

149997690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964 (or 1958 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 149997690 is about 12247.3544081977. The cubic root of 149997690 is about 531.3265570870.

The spelling of 149997690 in words is "one hundred forty-nine million, nine hundred ninety-seven thousand, six hundred ninety".