39690870 has 96 divisors (see below), whose sum is σ = 103680864. Its totient is φ = 9715200.

The previous prime is 39690863. The next prime is 39690877. The reversal of 39690870 is 7809693.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (39690863) and next prime (39690877).

It is a super-2 number, since 2×39690870² = 3150730322713800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39690877) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 650640 + ... + 650700.

It is an arithmetic number, because the mean of its divisors is an integer number (1080009).

Almost surely, 2^39690870 is an apocalyptic number.

39690870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 39690870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51840432).

39690870 is an abundant number, since it is smaller than the sum of its proper divisors (63989994).

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

39690870 is a wasteful number, since it uses less digits than its factorization.

39690870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 39690870 is about 6300.0690472407. The cubic root of 39690870 is about 341.1119018830. Note that the first 3 decimals are identical.

The spelling of 39690870 in words is "thirty-nine million, six hundred ninety thousand, eight hundred seventy".