149018399 has 4 divisors (see below), whose sum is σ = 149172840. Its totient is φ = 148863960.

The previous prime is 149018393. The next prime is 149018431. The reversal of 149018399 is 993810941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149018399 - 2⁴ = 149018383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149018393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75764 + ... + 77705.

It is an arithmetic number, because the mean of its divisors is an integer number (37293210).

Almost surely, 2^149018399 is an apocalyptic number.

149018399 is a deficient number, since it is larger than the sum of its proper divisors (154441).

149018399 is an equidigital number, since it uses as much as digits as its factorization.

149018399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154440.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 149018399 is about 12207.3092448746. The cubic root of 149018399 is about 530.1677397153.

The spelling of 149018399 in words is "one hundred forty-nine million, eighteen thousand, three hundred ninety-nine".