247404442 has 4 divisors (see below), whose sum is σ = 371106666. Its totient is φ = 123702220.

The previous prime is 247404433. The next prime is 247404457. The reversal of 247404442 is 244404742.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244404742 = 2 ⋅122202371.

It can be written as a sum of positive squares in only one way, i.e., 190688481 + 56715961 = 13809^2 + 7531^2 .

It is a super-2 number, since 2×247404442² = 122417915842662728, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61851109 + ... + 61851112.

Almost surely, 2^247404442 is an apocalyptic number.

247404442 is a deficient number, since it is larger than the sum of its proper divisors (123702224).

247404442 is a wasteful number, since it uses less digits than its factorization.

247404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123702223.

The product of its (nonzero) digits is 28672, while the sum is 31.

The square root of 247404442 is about 15729.0953967480. The cubic root of 247404442 is about 627.7728041397.

The spelling of 247404442 in words is "two hundred forty-seven million, four hundred four thousand, four hundred forty-two".