149693993 has 16 divisors (see below), whose sum is σ = 163141776. Its totient is φ = 136796160.

The previous prime is 149693981. The next prime is 149694029. The reversal of 149693993 is 399396941.

It can be written as a sum of positive squares in 8 ways, for example, as 29506624 + 120187369 = 5432^2 + 10963^2 .

It is a cyclic number.

It is not a de Polignac number, because 149693993 - 2¹⁰ = 149692969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149693923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203855 + ... + 204587.

It is an arithmetic number, because the mean of its divisors is an integer number (10196361).

Almost surely, 2^149693993 is an apocalyptic number.

It is an amenable number.

149693993 is a deficient number, since it is larger than the sum of its proper divisors (13447783).

149693993 is a wasteful number, since it uses less digits than its factorization.

149693993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its digits is 1417176, while the sum is 53.

The square root of 149693993 is about 12234.9496525323. The cubic root of 149693993 is about 530.9677264359.

The spelling of 149693993 in words is "one hundred forty-nine million, six hundred ninety-three thousand, nine hundred ninety-three".