1972138628 has 24 divisors (see below), whose sum is σ = 3553972800. Its totient is φ = 956860128.

The previous prime is 1972138589. The next prime is 1972138673. The reversal of 1972138628 is 8268312791.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38513 + ... + 73671.

It is an arithmetic number, because the mean of its divisors is an integer number (148082200).

Almost surely, 2^1972138628 is an apocalyptic number.

It is an amenable number.

1972138628 is a deficient number, since it is larger than the sum of its proper divisors (1581834172).

1972138628 is a wasteful number, since it uses less digits than its factorization.

1972138628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35579 (or 35577 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 1972138628 is about 44408.7674676972. The cubic root of 1972138628 is about 1254.0431488976.

The spelling of 1972138628 in words is "one billion, nine hundred seventy-two million, one hundred thirty-eight thousand, six hundred twenty-eight".