102149442 has 12 divisors (see below), whose sum is σ = 221323830. Its totient is φ = 34049808.

The previous prime is 102149431. The next prime is 102149461. The reversal of 102149442 is 244941201.

It is a happy number.

102149442 is a `hidden beast` number, since 1 + 0 + 214 + 9 + 442 = 666.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 1929321 = 10011^2 + 1389^2 .

It is a super-2 number, since 2×102149442² = 20869017001822728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2837467 + ... + 2837502.

Almost surely, 2^102149442 is an apocalyptic number.

102149442 is an abundant number, since it is smaller than the sum of its proper divisors (119174388).

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

102149442 is a wasteful number, since it uses less digits than its factorization.

102149442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674977 (or 5674974 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 102149442 is about 10106.9007118899. The cubic root of 102149442 is about 467.4609451966.

The spelling of 102149442 in words is "one hundred two million, one hundred forty-nine thousand, four hundred forty-two".