3701999978 has 4 divisors (see below), whose sum is σ = 5552999970. Its totient is φ = 1850999988.

The previous prime is 3701999963. The next prime is 3702000013. The reversal of 3701999978 is 8799991073.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 2189023369 + 1512976609 = 46787^2 + 38897^2 .

It is a super-2 number, since 2×3701999978² = 27409607674224000968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3701999978.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925499993 + ... + 925499996.

Almost surely, 2^3701999978 is an apocalyptic number.

3701999978 is a deficient number, since it is larger than the sum of its proper divisors (1850999992).

3701999978 is a wasteful number, since it uses less digits than its factorization.

3701999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1850999991.

The product of its (nonzero) digits is 7715736, while the sum is 62.

The square root of 3701999978 is about 60844.0627999150. The cubic root of 3701999978 is about 1546.9590016583.

The spelling of 3701999978 in words is "three billion, seven hundred one million, nine hundred ninety-nine thousand, nine hundred seventy-eight".